Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2dd80ff9f944fb…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 12:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e69a9d05971a9baf65371b042b64c87c SHA-1: cb16204ab3172775ccff9941df72deb41e3a36b0 SHA-256: fb2dd80ff9f944fbd3ad332538e09174b9423b64f20641f53d2bf05e41be830f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection and analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=free+sip+calling+android PDF link annotation
    • http://www.jindatunnel.com/up_files/file/kuboja.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/85138446620.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/modemaza.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/pom7bduogp73io67d5rmag5i5n/91267566215.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d281fd6b0e---nefiped.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/rokarazagalifenorix.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/98123243950.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/10973514211.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/jewidojijakozorufoketorod.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/70363733980.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/tepevunanepozufijiz.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/witezejonujezu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f30eacb47e24dfb8536ecef81deb1d6a/9020574110.pdfIn PDF document text
    • http://epicridesnepal.com/files/muduzalamovomukogusofa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/togiwawejokizusesu.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/rebimidamun.pdfIn PDF document text
    • http://cwesp.biz/upload/file/65015234761.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/zowerolozujekize.pdfIn PDF document text
    • http://dongphat.net/upload/files/62670387460.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a31155fb---gufofud.pdfIn PDF document text
    • http://www.moyekolodin.com/files/62497666687.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/43925252797.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/gobevume.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3dd1added0660d66ee2c05055c831810/53229952566.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/17807542652.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/29763728611.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/zikugefoxo.pdfIn PDF document text
    • http://jar-ted.pl/file/25689316084.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EF 10568 bytes
SHA-256: fb50a24b31022f1503b0be86b239c50a22ea18cda815b4ea2b1fa9e5741342da
font_02_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 18860 bytes
SHA-256: 4cc4e5245494b2ef77ce0aaa179b0db9e72d3ce78c19c6b235143ac18b5b7b4b

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